Genuine OEM Audi Lambda Oxygen Sensor, part number 8W0906265AJ. This sensor is positioned in the rear of the exhaust system and plays a vital role in engine management by accurately measuring the oxygen content in the exhaust gases. Its readings are used by the engine control unit to optimize the air-fuel mixture, ensuring efficient combustion and reduced emissions. Weighing 0.165 kg, this sensor is designed for precise calibration and signal characteristics, which are essential for maintaining optimal engine performance and meeting emissions standards.